铜陵地区中生代侵入岩LA-ICP-MS锆石U-Pb年代学及Cu-Au成矿指示意义

谢建成,杨晓勇,杜建国,孙卫东. 铜陵地区中生代侵入岩LA-ICP-MS锆石U-Pb年代学及Cu-Au成矿指示意义[J]. 岩石学报, 2008, 24(8).
引用本文: 谢建成,杨晓勇,杜建国,孙卫东. 铜陵地区中生代侵入岩LA-ICP-MS锆石U-Pb年代学及Cu-Au成矿指示意义[J]. 岩石学报, 2008, 24(8).
XIE JianCheng,YANG XiaoYong,DU JianGuo,SUN WeiDong. Zircon U-Pb geochronology of the Mesozoic intrusive rocks in the Tongling region: Implications for copper-gold mineralization[J]. Acta Petrologica Sinica, 2008, 24(8).
Citation: XIE JianCheng,YANG XiaoYong,DU JianGuo,SUN WeiDong. Zircon U-Pb geochronology of the Mesozoic intrusive rocks in the Tongling region: Implications for copper-gold mineralization[J]. Acta Petrologica Sinica, 2008, 24(8).

铜陵地区中生代侵入岩LA-ICP-MS锆石U-Pb年代学及Cu-Au成矿指示意义

  • 基金项目:

    中国科学院基金,安徽省优秀青年科技基金,安徽国土资源厅铜陵深部找矿专题资助

Zircon U-Pb geochronology of the Mesozoic intrusive rocks in the Tongling region: Implications for copper-gold mineralization

  • 安徽铜陵地区是我国著名的Cu-Au多金属产地之一,金属成矿与燕山期岩浆作用关系密切.本次对铜陵地区石英(二长)闪长岩和花岗闪长岩系统地进行了LA-ICP-MS锆石年代学研究.高质量锆石U-Pb同位素206Pb/238U加权平均年龄结果表明铜陵地区中酸性侵入岩的成岩序列可能为花岗闪长岩(141Ma)→辉石(二长)闪长岩(139Ma)→石英(二长)闪长岩(135Ms,136Ma,137Ms).对比已有的高精度锆石U-Pb同位素年龄,我们认为铜陵地区岩体侵入后可能有个快速冷却的过程.铜陵地区与Cu-Au矿床有关的最主要侵入岩LA-ICP-MS锆石数据给出两组年龄:130~132Ma和138~140Ma.据高精度锆石U-Pb数据和一些矿床的Re-Os年龄,结合锆石元素地球化学资料,本文得出铜陵地区主要表现出两次成矿事件:早期成矿事件是与高Ce异常流体密切相关的铜金成矿事件(辉钼矿Re-Os年龄138~140Ma);晚期成矿事件可能与低Ce异常流体密切相关的铁硫成矿事件(黄铁矿Re-Os年龄约126Ma).
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